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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

This PR improves advanced paste telemetry. Here's what's changed

- Added `AdvancedPasteClipboardItemClicked` event
- Changed `CustomFormatEvent` to only fire on successful completion and
include the number of tokens used, and the model name

Here are the goals of adding this telemtry:

- `AdvancedPasteClipboardItemClicked` helps us estimate the total number
of user who are using the clipboard history feature, which helps us
prioritize future investments and improvements in PowerToys. (This is
just regular feature usage data).
- `CustomFormatEvent` now includes number of tokens used, and the model
name. We are considering using alternative models to power Advanced
Paste (as we've heard feedback about this), and these different models
could have different token lengths. Understanding the average usage will
help us make good decisions that will benefit the most users. As well,
the model name is hard coded right now, but in the future if we do add
different AI models for completion then this will help us compare their
performance.

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## PR Checklist

- [X] Communication: I've discussed this with core contributors already.
If work hasn't been agreed, this work might be rejected


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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

The details above are detailed enough since this change is super small. 

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

Ensured that PowerToys successfully built (Need help verifying the
events fire off correctly).